@ vim:filetype=armasm @ memory handlers with banking support for SSF II - The New Challengers @ mostly based on Gens code @ (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas @ All Rights Reserved .text @ default jump tables m_read8_def_table: .long m_read8_rom0 @ 0x000000 - 0x07FFFF .long m_read8_rom1 @ 0x080000 - 0x0FFFFF .long m_read8_rom2 @ 0x100000 - 0x17FFFF .long m_read8_rom3 @ 0x180000 - 0x1FFFFF .long m_read8_rom4 @ 0x200000 - 0x27FFFF .long m_read8_rom5 @ 0x280000 - 0x2FFFFF .long m_read8_rom6 @ 0x300000 - 0x37FFFF .long m_read8_rom7 @ 0x380000 - 0x3FFFFF .long m_read8_rom8 @ 0x400000 - 0x47FFFF .long m_read8_rom9 @ 0x480000 - 0x4FFFFF .long m_read8_romA @ 0x500000 - 0x57FFFF .long m_read8_romB @ 0x580000 - 0x5FFFFF .long m_read8_romC @ 0x600000 - 0x67FFFF .long m_read8_romD @ 0x680000 - 0x6FFFFF .long m_read8_romE @ 0x700000 - 0x77FFFF .long m_read8_romF @ 0x780000 - 0x7FFFFF .long m_read_null @ 0x800000 - 0x87FFFF .long m_read_null @ 0x880000 - 0x8FFFFF .long m_read_null @ 0x900000 - 0x97FFFF .long m_read_null @ 0x980000 - 0x9FFFFF .long m_read8_misc @ 0xA00000 - 0xA7FFFF .long m_read_null @ 0xA80000 - 0xAFFFFF .long m_read_null @ 0xB00000 - 0xB7FFFF .long m_read_null @ 0xB80000 - 0xBFFFFF .long m_read8_vdp @ 0xC00000 - 0xC7FFFF .long m_read8_vdp @ 0xC80000 - 0xCFFFFF .long m_read_null @ 0xD00000 - 0xD7FFFF .long m_read_null @ 0xD80000 - 0xDFFFFF .long m_read8_ram @ 0xE00000 - 0xE7FFFF .long m_read8_ram @ 0xE80000 - 0xEFFFFF .long m_read8_ram @ 0xF00000 - 0xF7FFFF .long m_read8_ram @ 0xF80000 - 0xFFFFFF m_read16_def_table: .long m_read16_rom0 @ 0x000000 - 0x07FFFF .long m_read16_rom1 @ 0x080000 - 0x0FFFFF .long m_read16_rom2 @ 0x100000 - 0x17FFFF .long m_read16_rom3 @ 0x180000 - 0x1FFFFF .long m_read16_rom4 @ 0x200000 - 0x27FFFF .long m_read16_rom5 @ 0x280000 - 0x2FFFFF .long m_read16_rom6 @ 0x300000 - 0x37FFFF .long m_read16_rom7 @ 0x380000 - 0x3FFFFF .long m_read16_rom8 @ 0x400000 - 0x47FFFF .long m_read16_rom9 @ 0x480000 - 0x4FFFFF .long m_read16_romA @ 0x500000 - 0x57FFFF .long m_read16_romB @ 0x580000 - 0x5FFFFF .long m_read16_romC @ 0x600000 - 0x67FFFF .long m_read16_romD @ 0x680000 - 0x6FFFFF .long m_read16_romE @ 0x700000 - 0x77FFFF .long m_read16_romF @ 0x780000 - 0x7FFFFF .long m_read_null @ 0x800000 - 0x87FFFF .long m_read_null @ 0x880000 - 0x8FFFFF .long m_read_null @ 0x900000 - 0x97FFFF .long m_read_null @ 0x980000 - 0x9FFFFF .long m_read16_misc @ 0xA00000 - 0xA7FFFF .long m_read_null @ 0xA80000 - 0xAFFFFF .long m_read_null @ 0xB00000 - 0xB7FFFF .long m_read_null @ 0xB80000 - 0xBFFFFF .long m_read16_vdp @ 0xC00000 - 0xC7FFFF .long m_read_null @ 0xC80000 - 0xCFFFFF .long m_read_null @ 0xD00000 - 0xD7FFFF .long m_read_null @ 0xD80000 - 0xDFFFFF .long m_read16_ram @ 0xE00000 - 0xE7FFFF .long m_read16_ram @ 0xE80000 - 0xEFFFFF .long m_read16_ram @ 0xF00000 - 0xF7FFFF .long m_read16_ram @ 0xF80000 - 0xFFFFFF m_read32_def_table: .long m_read32_rom0 @ 0x000000 - 0x07FFFF .long m_read32_rom1 @ 0x080000 - 0x0FFFFF .long m_read32_rom2 @ 0x100000 - 0x17FFFF .long m_read32_rom3 @ 0x180000 - 0x1FFFFF .long m_read32_rom4 @ 0x200000 - 0x27FFFF .long m_read32_rom5 @ 0x280000 - 0x2FFFFF .long m_read32_rom6 @ 0x300000 - 0x37FFFF .long m_read32_rom7 @ 0x380000 - 0x3FFFFF .long m_read32_rom8 @ 0x400000 - 0x47FFFF .long m_read32_rom9 @ 0x480000 - 0x4FFFFF .long m_read32_romA @ 0x500000 - 0x57FFFF .long m_read32_romB @ 0x580000 - 0x5FFFFF .long m_read32_romC @ 0x600000 - 0x67FFFF .long m_read32_romD @ 0x680000 - 0x6FFFFF .long m_read32_romE @ 0x700000 - 0x77FFFF .long m_read32_romF @ 0x780000 - 0x7FFFFF .long m_read_null @ 0x800000 - 0x87FFFF .long m_read_null @ 0x880000 - 0x8FFFFF .long m_read_null @ 0x900000 - 0x97FFFF .long m_read_null @ 0x980000 - 0x9FFFFF .long m_read32_misc @ 0xA00000 - 0xA7FFFF .long m_read_null @ 0xA80000 - 0xAFFFFF .long m_read_null @ 0xB00000 - 0xB7FFFF .long m_read_null @ 0xB80000 - 0xBFFFFF .long m_read32_vdp @ 0xC00000 - 0xC7FFFF .long m_read_null @ 0xC80000 - 0xCFFFFF .long m_read_null @ 0xD00000 - 0xD7FFFF .long m_read_null @ 0xD80000 - 0xDFFFFF .long m_read32_ram @ 0xE00000 - 0xE7FFFF .long m_read32_ram @ 0xE80000 - 0xEFFFFF .long m_read32_ram @ 0xF00000 - 0xF7FFFF .long m_read32_ram @ 0xF80000 - 0xFFFFFF @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ .bss @.section .bss, "brw" @.data @ used tables m_read8_table: .skip 32*4 m_read16_table: .skip 32*4 m_read32_table: .skip 32*4 @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ .text .global PicoMemReset .global PicoRead8 .global PicoRead16 .global PicoRead32 .global PicoWriteRomHW_SSF2 PicoMemReset: ldr r12,=(Pico+0x22204) ldr r12,[r12] @ romsize add r12,r12,#0x80000 sub r12,r12,#1 mov r12,r12,lsr #19 ldr r0, =m_read8_table ldr r1, =m_read8_def_table mov r2, #32 1: ldr r3, [r1], #4 str r3, [r0], #4 subs r2, r2, #1 bne 1b ldr r0, =m_read16_table ldr r1, =m_read16_def_table mov r2, #32 1: subs r2, r2, #1 ldr r3, [r1], #4 str r3, [r0], #4 bne 1b ldr r0, =m_read32_table ldr r1, =m_read32_def_table mov r2, #32 1: subs r2, r2, #1 ldr r3, [r1], #4 str r3, [r0], #4 bne 1b @ update memhandlers according to ROM size ldr r1, =m_read8_above_rom ldr r0, =m_read8_table mov r2, #16 1: sub r2, r2, #1 cmp r2, r12 blt 2f cmp r2, #4 beq 1b @ do not touch the SRAM area str r1, [r0, r2, lsl #2] b 1b 2: ldr r1, =m_read16_above_rom ldr r0, =m_read16_table mov r2, #16 1: sub r2, r2, #1 cmp r2, r12 blt 2f cmp r2, #4 beq 1b str r1, [r0, r2, lsl #2] b 1b 2: ldr r1, =m_read32_above_rom ldr r0, =m_read32_table mov r2, #16 1: sub r2, r2, #1 cmp r2, r12 blt 2f cmp r2, #4 beq 1b str r1, [r0, r2, lsl #2] b 1b 2: bx lr .pool @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ PicoRead8: @ u32 a ldr r2, =m_read8_table bic r0, r0, #0xff000000 and r1, r0, #0x00f80000 ldr pc, [r2, r1, lsr #17] PicoRead16: @ u32 a ldr r2, =m_read16_table bic r0, r0, #0xff000000 and r1, r0, #0x00f80000 ldr pc, [r2, r1, lsr #17] PicoRead32: @ u32 a ldr r2, =m_read32_table bic r0, r0, #0xff000000 and r1, r0, #0x00f80000 ldr pc, [r2, r1, lsr #17] .pool @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ m_read_null: mov r0, #0 bx lr .macro m_read8_rom sect ldr r1, =(Pico+0x22200) bic r0, r0, #0xf80000 ldr r1, [r1] .if \sect orr r0, r0, #0x080000*\sect .endif eor r0, r0, #1 ldrb r0, [r1, r0] bx lr .endm m_read8_rom0: @ 0x000000 - 0x07ffff m_read8_rom 0 m_read8_rom1: @ 0x080000 - 0x0fffff m_read8_rom 1 m_read8_rom2: @ 0x100000 - 0x17ffff m_read8_rom 2 m_read8_rom3: @ 0x180000 - 0x1fffff m_read8_rom 3 m_read8_rom4: @ 0x200000 - 0x27ffff, SRAM area ldr r2, =(SRam) ldr r3, =(Pico+0x22200) ldr r1, [r2, #8] @ SRam.end bic r0, r0, #0xf80000 orr r0, r0, #0x200000 cmp r0, r1 bgt m_read8_nosram ldr r1, [r2, #4] @ SRam.start (1ci) cmp r0, r1 blt m_read8_nosram ldrb r1, [r3, #0x11] @ Pico.m.sram_reg (1ci) sub r12,r0, #0x200000 tst r1, #0x10 bne m_read8_detected cmp r12,#1 ble m_read8_detected tst r1, #1 orrne r1, r1, #0x10 strneb r1, [r3, #0x11] m_read8_detected: tst r1, #4 @ EEPROM read? ldrne r0, =SRAMReadEEPROM @ (1ci if ne) bxne r0 m_read8_noteeprom: tst r1, #1 beq m_read8_nosram ldr r3, [r2] @ SRam.data ldr r2, [r2, #4] @ SRam.start (1ci) sub r3, r3, r2 ldrb r0, [r3, r0] bx lr m_read8_nosram: ldr r1, [r3, #4] @ 1ci cmp r0, r1 movgt r0, #0 bxgt lr @ bad location ldr r1, [r3] eor r0, r0, #1 ldrb r0, [r1, r0] bx lr m_read8_rom5: @ 0x280000 - 0x2fffff m_read8_rom 5 m_read8_rom6: @ 0x300000 - 0x37ffff m_read8_rom 6 m_read8_rom7: @ 0x380000 - 0x3fffff m_read8_rom 7 m_read8_rom8: @ 0x400000 - 0x47ffff m_read8_rom 8 m_read8_rom9: @ 0x480000 - 0x4fffff m_read8_rom 9 @ is any ROM using that much? m_read8_romA: @ 0x500000 - 0x57ffff m_read8_rom 0xA m_read8_romB: @ 0x580000 - 0x5fffff m_read8_rom 0xB m_read8_romC: @ 0x600000 - 0x67ffff m_read8_rom 0xC m_read8_romD: @ 0x680000 - 0x6fffff m_read8_rom 0xD m_read8_romE: @ 0x700000 - 0x77ffff m_read8_rom 0xE m_read8_romF: @ 0x780000 - 0x7fffff m_read8_rom 0xF m_read8_misc: bic r2, r0, #0x00ff bic r2, r2, #0xbf00 cmp r2, #0xa00000 @ Z80 RAM? ldreq r2, =z80Read8 bxeq r2 stmfd sp!,{r0,lr} bic r0, r0, #1 mov r1, #8 bl OtherRead16 ldmfd sp!,{r1,lr} tst r1, #1 moveq r0, r0, lsr #8 bx lr m_read8_vdp: tst r0, #0x70000 tsteq r0, #0x000e0 bxne lr @ invalid read stmfd sp!,{r0,lr} bic r0, r0, #1 bl PicoVideoRead ldmfd sp!,{r1,lr} tst r1, #1 moveq r0, r0, lsr #8 bx lr m_read8_ram: ldr r1, =Pico bic r0, r0, #0xff0000 eor r0, r0, #1 ldrb r0, [r1, r0] bx lr m_read8_above_rom: stmfd sp!,{r0,lr} bic r0, r0, #1 mov r1, #8 bl OtherRead16End ldmfd sp!,{r1,lr} tst r1, #1 moveq r0, r0, lsr #8 bx lr .pool @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ .macro m_read16_rom sect ldr r1, =(Pico+0x22200) bic r0, r0, #0xf80000 ldr r1, [r1] bic r0, r0, #1 .if \sect orr r0, r0, #0x080000*\sect .endif ldrh r0, [r1, r0] bx lr .endm m_read16_rom0: @ 0x000000 - 0x07ffff m_read16_rom 0 m_read16_rom1: @ 0x080000 - 0x0fffff m_read16_rom 1 m_read16_rom2: @ 0x100000 - 0x17ffff m_read16_rom 2 m_read16_rom3: @ 0x180000 - 0x1fffff m_read16_rom 3 m_read16_rom4: @ 0x200000 - 0x27ffff, SRAM area (NBA Live 95) ldr r2, =(SRam) ldr r3, =(Pico+0x22200) ldr r1, [r2, #8] @ SRam.end bic r0, r0, #0xf80000 bic r0, r0, #1 orr r0, r0, #0x200000 cmp r0, r1 bgt m_read16_nosram ldrb r1, [r3, #0x11] @ Pico.m.sram_reg (2ci) tst r1, #1 beq m_read16_nosram ldr r1, [r2, #4] @ SRam.start (1ci) cmp r0, r1 blt m_read16_nosram ldr r2, [r2] @ SRam.data (1ci) sub r2, r2, r1 ldrh r0, [r2, r0] @ 2ci and r1, r0, #0xff mov r0, r0, lsr #8 orr r0, r0, r1, lsl #8 bx lr m_read16_nosram: ldr r1, [r3, #4] @ 1ci cmp r0, r1 movgt r0, #0 bxgt lr @ bad location ldr r1, [r3] @ 1ci ldrh r0, [r1, r0] bx lr m_read16_rom5: @ 0x280000 - 0x2fffff m_read16_rom 5 m_read16_rom6: @ 0x300000 - 0x37ffff m_read16_rom 6 m_read16_rom7: @ 0x380000 - 0x3fffff m_read16_rom 7 m_read16_rom8: @ 0x400000 - 0x47ffff m_read16_rom 8 m_read16_rom9: @ 0x480000 - 0x4fffff m_read16_rom 9 @ is any ROM using that much? m_read16_romA: @ 0x500000 - 0x57ffff m_read16_rom 0xA m_read16_romB: @ 0x580000 - 0x5fffff m_read16_rom 0xB m_read16_romC: @ 0x600000 - 0x67ffff m_read16_rom 0xC m_read16_romD: @ 0x680000 - 0x6fffff m_read16_rom 0xD m_read16_romE: @ 0x700000 - 0x77ffff m_read16_rom 0xE m_read16_romF: @ 0x780000 - 0x7fffff m_read16_rom 0xF m_read16_misc: bic r0, r0, #1 mov r1, #16 b OtherRead16 m_read16_vdp: tst r0, #0x70000 tsteq r0, #0x000e0 bxne lr @ invalid read bic r0, r0, #1 b PicoVideoRead m_read16_ram: ldr r1, =Pico bic r0, r0, #0xff0000 bic r0, r0, #1 ldrh r0, [r1, r0] bx lr m_read16_above_rom: bic r0, r0, #1 mov r1, #16 b OtherRead16End .pool @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ .macro m_read32_rom sect ldr r1, =(Pico+0x22200) bic r0, r0, #0xf80000 ldr r1, [r1] bic r0, r0, #1 .if \sect orr r0, r0, #0x080000*\sect .endif ldrh r0, [r1, r0]! ldrh r1, [r1, #2] @ 1ci orr r0, r1, r0, lsl #16 bx lr .endm m_read32_rom0: @ 0x000000 - 0x07ffff m_read32_rom 0 m_read32_rom1: @ 0x080000 - 0x0fffff m_read32_rom 1 m_read32_rom2: @ 0x100000 - 0x17ffff m_read32_rom 2 m_read32_rom3: @ 0x180000 - 0x1fffff m_read32_rom 3 m_read32_rom4: @ 0x200000 - 0x27ffff, SRAM area (does any game do long reads?) ldr r2, =(SRam) ldr r3, =(Pico+0x22200) ldr r1, [r2, #8] @ SRam.end bic r0, r0, #0xf80000 bic r0, r0, #1 orr r0, r0, #0x200000 cmp r0, r1 bgt m_read32_nosram ldrb r1, [r3, #0x11] @ Pico.m.sram_reg (2ci) tst r1, #1 beq m_read32_nosram ldr r1, [r2, #4] @ SRam.start (1ci) cmp r0, r1 blt m_read32_nosram ldr r2, [r2] @ SRam.data (1ci) sub r2, r2, r1 ldrh r0, [r2, r0]! @ (1ci) ldrh r1, [r2, #2] orr r0, r0, r0, lsl #16 mov r0, r0, ror #8 mov r0, r0, lsl #16 orr r0, r0, r1, lsr #8 and r1, r1, #0xff orr r0, r0, r1, lsl #8 bx lr m_read32_nosram: ldr r1, [r3, #4] @ (1ci) cmp r0, r1 movgt r0, #0 bxgt lr @ bad location ldr r1, [r3] @ (1ci) ldrh r0, [r1, r0]! ldrh r1, [r1, #2] @ (2ci) orr r0, r1, r0, lsl #16 bx lr m_read32_rom5: @ 0x280000 - 0x2fffff m_read32_rom 5 m_read32_rom6: @ 0x300000 - 0x37ffff m_read32_rom 6 m_read32_rom7: @ 0x380000 - 0x3fffff m_read32_rom 7 m_read32_rom8: @ 0x400000 - 0x47ffff m_read32_rom 8 m_read32_rom9: @ 0x480000 - 0x4fffff m_read32_rom 9 @ is any ROM using that much? m_read32_romA: @ 0x500000 - 0x57ffff m_read32_rom 0xA m_read32_romB: @ 0x580000 - 0x5fffff m_read32_rom 0xB m_read32_romC: @ 0x600000 - 0x67ffff m_read32_rom 0xC m_read32_romD: @ 0x680000 - 0x6fffff m_read32_rom 0xD m_read32_romE: @ 0x700000 - 0x77ffff m_read32_rom 0xE m_read32_romF: @ 0x780000 - 0x7fffff m_read32_rom 0xF m_read32_misc: bic r0, r0, #1 stmfd sp!,{r0,lr} mov r1, #32 bl OtherRead16 mov r1, r0 ldmfd sp!,{r0} stmfd sp!,{r1} add r0, r0, #2 mov r1, #32 bl OtherRead16 ldmfd sp!,{r1,lr} orr r0, r0, r1, lsl #16 bx lr m_read32_vdp: tst r0, #0x70000 tsteq r0, #0x000e0 bxne lr @ invalid read bic r0, r0, #1 add r1, r0, #2 stmfd sp!,{r1,lr} bl PicoVideoRead swp r0, r0, [sp] bl PicoVideoRead ldmfd sp!,{r1,lr} orr r0, r0, r1, lsl #16 bx lr m_read32_ram: ldr r1, =Pico bic r0, r0, #0xff0000 bic r0, r0, #1 ldrh r0, [r1, r0]! ldrh r1, [r1, #2] @ 2ci orr r0, r1, r0, lsl #16 bx lr m_read32_above_rom: bic r0, r0, #1 stmfd sp!,{r0,lr} mov r1, #32 bl OtherRead16End mov r1, r0 ldmfd sp!,{r0} stmfd sp!,{r1} add r0, r0, #2 mov r1, #32 bl OtherRead16End ldmfd sp!,{r1,lr} orr r0, r0, r1, lsl #16 bx lr .pool @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ PicoWriteRomHW_SSF2: @ u32 a, u32 d and r0, r0, #0xe movs r0, r0, lsr #1 bne pwr_banking @ sram register ldr r2, =(Pico+0x22211) @ Pico.m.sram_reg ldrb r0, [r2] and r1, r1, #3 bic r0, r0, #3 orr r0, r0, r1 strb r0, [r2] bx lr pwr_banking: and r1, r1, #0x1f ldr r3, =m_read8_def_table ldr r2, =m_read8_table ldr r12, [r3, r1, lsl #2] str r12, [r2, r0, lsl #2] ldr r3, =m_read16_def_table ldr r2, =m_read16_table ldr r12, [r3, r1, lsl #2] str r12, [r2, r0, lsl #2] ldr r3, =m_read32_def_table ldr r2, =m_read32_table ldr r12, [r3, r1, lsl #2] str r12, [r2, r0, lsl #2] bx lr